1111100100221 has 4 divisors (see below), whose sum is σ = 1123584371100. Its totient is φ = 1098615829344.

The previous prime is 1111100100197. The next prime is 1111100100223. The reversal of 1111100100221 is 1220010011111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132605222500 + 978494877721 = 364150^2 + 989189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111100100221 - 2²⁶ = 1111032991357 is a prime.

It is a super-2 number, since 2×1111100100221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111100100223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6242135306 + ... + 6242135483.

It is an arithmetic number, because the mean of its divisors is an integer number (280896092775).

Almost surely, 2^{1111100100221} is an apocalyptic number.

It is an amenable number.

1111100100221 is a deficient number, since it is larger than the sum of its proper divisors (12484270879).

1111100100221 is an equidigital number, since it uses as much as digits as its factorization.

1111100100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12484270878.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1111100100221 its reverse (1220010011111), we get a palindrome (2331110111332).

The spelling of 1111100100221 in words is "one trillion, one hundred eleven billion, one hundred million, one hundred thousand, two hundred twenty-one".